In indirect bad gap semiconductor TiO2 and have defects TiO2-x what is the timescale of excitons to do recombnation ?

Please explain in bulk TiO2 and TiO2-x, I want to know EPR recorded at room temperature no signal observed for rutile phase but at 77 K a sharp signal observed that is explained on basis of...

06 July 2018 3,383 0 View

XRD data at different wavelength and CIF data at different wavelength than how to refinement?

If the XRD data is recorded at Wavelength such as =0.688 Angstrom and I want to do refine the parmeter of XRD pattern for that purpose I need CIF file from the data. How I can choose the file...

11 December 2017 5,348 5 View

How many PEO group and PPO group are present in Pluronic F-108 and Pluronic F-127 and P-123?

PEO-PPO-PEO I am confused as the ratio I got i different paers are different as Pluronic F-127 100-65-100 and some where it is written 101-56-101 I need to know about F-108 as written 133-49-133...

11 December 2017 1,658 0 View

How do I calculate and put d-spacing value in electron diffraction in mixed phase system of Titania?

I am having a mixed phase system I want to index a ring pattern of electron diffraction pattern but I am unable to find the value matching. please any one explain. I am attaching here JCPDS of...

07 August 2017 3,201 4 View

How to calculate appropriate Volume value with significant digit ?

If I know the refined cell parameters of XRD pattern with significant digit like a= 3.789456(12) and 9.3345(5) how do I multiply them to get correct value of Volume= a2 c (angstrom) with...

07 August 2017 2,505 8 View

How to write correct wayto represent lattice parameter with significant digit?

05 June 2017 1,842 4 View

What are F- and F+ centres (Farbe centre or color centre ) how they formed ?

Farbe centres in lattice, I need literature to know how theyformed in lattice and how color changed occurs.

04 May 2017 7,598 0 View

How can we calculate (%) how much of UV,Visible and IR light absorb by Metal oxide like Titanium dioxide using Absorbance spectra Plot?

Different sample will absorb different portion of UV,visible and IR portion, Is that possible to calculate the percentage of each portion, how much UV light in (%) is absorbed or visible light or...

03 April 2017 354 3 View

Ytterbium stablized mesoporous titania, why there is so much broad peaks in XRD which sites will be occupied by Ytterbium?

02 March 2017 3,510 4 View

How well ordered Structure like SBA-15, MCM-41 are correlated to show there low angle XRD reflections?

Why small angle XRD pattern shows peaks for hexagonal and cubic symmetric structure like SBA-15, MCM-41. Reflection at 100, 110 and 200

01 February 2017 8,054 1 View

What kind of fluid could I use for a pitfall trap that also does not invalidate molecular testing?

Hi, I want to start testing pitfall trap to obtain ants samples, but I need to conduct molecular analysis on those insects. So, what kind of fluid can I use? Ethanol expires too early and I need...

03 March 2021 5,978 5 View

Sample dilution for quantitative analysis using ELISA?

If the detection range is in ng/ml but the reference range is in ug/ml for a molecule or protein in serum or plasma .how to dilute and what is the initial volume to be taken for quantitative analysis

02 March 2021 7,670 3 View

Would fecal samples stored at -20C for over a year impact metagenomic analysis?

Dear All, I have access to some rodent fecal samples that have been stored at -20C instead of -80C. Anyone have experience with the impact of stowage condition on comparative metagenomic analysis...

01 March 2021 2,512 1 View

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01 March 2021 3,905 5 View

What test should I use to compare two or three means, if data is not normally distributed but sample size is > 30 in each group?

I personally feel this as a most confusing question. As per my understanding, if sample size is > 30, and sample is skewed, we can still use paramteric approach, as it will follow Z...

01 March 2021 1,587 6 View

Can polymer concentrations be calculated based on the number average molecular weight?

Hello, I spin-cast two different polymers onto wafers and measure their height as a function of initial concentration. For polymer A, I have the weight-average molecular weight (Mw) as well as...

28 February 2021 7,882 2 View

Does different dilution factors affect negatively on NH3 reading ?

I have a sample of treated water sample & asked to obtain ammonia conc. in sample using a machine with 5-25 ppm detection range. However, upon testing with different dilution factors, all...

27 February 2021 8,483 3 View

How to compare 2 samples recruited with different sampling methods?

If I want to compare characteristics of 2 groups of patients, one group is recruited from a random sample of the general public while another group is from a sample with a fixed gender (male to...

26 February 2021 3,526 3 View

Can random sampling have inclusion criteria?

As random sampling means that everyone in the population have an equal chance to be chosen, can it have inclusion criteria? My research participants have been chosen based on the inclusion...

26 February 2021 6,905 10 View

Sample size determination for non-parametric tests?

How do I run a a priori sample size determination for non-parametric tests, like the Mann-Whitney U-test and the Kruskall-Wallis or other non-parametric tests that accord with the unpaired t-test...

24 February 2021 166 6 View